I'm not sure if having the same gotq several months in a row would have the intended effekt of getting people to donate more ... they may be different colors, but I still think the novelty would wear off and by the fourth month people would be like "eh, I already have this in a few variations I like, I don't neccesarily need to spend real money on another

"
Not to mention if an item is not someone's taste, they'll have little extra incentive to donate for several months in a row, instead of just one month.
Chrizine's point about the value of the tiers becoming mixed up because people's taste in colors is different is also a good one.
And personally, I wouldn't want to loose the monthly golden gotq as it is now in the first place :<
The way I understood Firn's last post was keeping the "normal" golden gotq as is, but creating new items for the lower tiers, and recoloring
those, which I think is a good idea?
It could imagine those to be small sets. Like a tiara, necklace, bracelet set, or pet sets like seperate butterflies on hand, shoulder and the upper right corner. So for example in may it's the butterflies in magenta, in june the jewelry set, july idk... wing set, august brings back the butterflies in blue, september the jewelry in a new recolor ... something like that :)
THough those would require quite a few new items

giving out a single item in three recolors for the 5, 10, 15 tiers and a couple months later in three different recolors would surely work as well!
Firn, how about conducting a survey, like back then with the food surveys, for people's favorite colors and color combos? That might help with determining the tiers, or what colors to use in the first place